AnswersIA-Chemistry A Survey of Chemistry AShifts in Equilibrium

Shifts in Equilibrium — Unit test Answers

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Consider the following chemical reaction of bromothymol blue indicator. It appears yellow in undissociated form and blue in its dissociated aqueous solution. HC2H3O2(aq) H+(aq) + C2H3O2–(aq)yellow blue What will be the color of the solution if a large amount of H2CO3 is added?

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A
The solution will remain yellow.
B
The solution will turn blue.
C
The solution will turn pink.
D
The solution will turn green.
2
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According to Le Chatelier’s principle, a change in pressure affects the chemical equilibrium of the reaction system under what condition?

A
The reactants and the products are in the solid phase.
B
The reactants and the products are in the liquid phase.
C
Some of the reactants or the products are in the gaseous phase.
D
Some of the reactants or the products are solid, and some are liquid.
3

According to Le Chatelier’s principle, what happens when the concentration of a product is reduced in a chemical reaction that was in equilibrium?

A
The equilibrium shifts to the right to favor the formation of products.
B
The equilibrium shifts to the left to favor the formation of reactants.
C
The equilibrium shifts in the exothermic direction.
D
The equilibrium shifts in the endothermic direction.
4

Consider the chemical equation in equilibrium. A(g) + 2B(g) C(g) + D(g) + heat What will happen to the equilibrium of this reaction if the temperature is increased?

Question illustration
A
It will shift to the left because heat is released.
B
It will shift to the left because heat is absorbed.
C
It will shift to the right because heat is released.
D
It will shift to the right because heat is absorbed.
5

The equation below shows a reaction that produces calcium carbonate.Ca(OH)2(s) + CO2(g) CaCO3(s) + H2O(l)Which describes a way to speed up the collisions between calcium hydroxide and carbon dioxide molecules to produce calcium carbonate faster?

Question illustration
A
Lower the temperature.
B
Use larger pieces of calcium hydroxide.
C
Lower the pressure.
D
Reduce the volume of the container.
6

How does an increase in reactant concentration affect the rate of reaction?

A
It leads to more frequent collisions, which increase reaction rate.
B
It leads to less frequent collisions, which increase reaction rate.
C
It leads to more frequent collisions, which decrease reaction rate.
D
It leads to less frequent collisions, which decrease reaction rate.
7

Which is true about reaction rates?

A
High reaction rates occur only in spontaneous reactions.
B
Low reaction rates occur only in nonspontaneous reactions.
C
Reaction rates are not dependent on high or low activation energies.
D
Reaction rates are not related to spontaneity.
8

Which statement is usually true about the relationship between activation energy and reaction rates?

A
Low activation energy barriers result in low rates.
B
High activation energy barriers result in low rates.
C
Low activation energy barriers result in no reaction.
D
High activation energy barriers result in no reaction.

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